diff --git a/backend/config/mail_listeners.go b/backend/config/mail_listeners.go
index 8525759..c234560 100644
--- a/backend/config/mail_listeners.go
+++ b/backend/config/mail_listeners.go
@@ -84,8 +84,7 @@ func validateMailListeners(smtp SMTPSectionConfig, email EmailSectionConfig) err
 	if security != MailSecurityBoth && security != MailSecuritySTARTTLS && security != MailSecurityImplicitTLS {
 		return ErrInvalidRuntimeConfig
 	}
-	relayConfigured := smtpRelayConfigured(smtp.Relay)
-	if relayConfigured && security != MailSecurityBoth {
+	if smtpRelayEnabled(smtp.Relay) && security != MailSecurityBoth {
 		relaySecurity := NormalizeMailSecurity(smtp.Relay.Security)
 		if relaySecurity != security {
 			return ErrInvalidSMTP
diff --git a/backend/config/manager_v2.go b/backend/config/manager_v2.go
index af97a96..d4dd300 100644
--- a/backend/config/manager_v2.go
+++ b/backend/config/manager_v2.go
@@ -870,6 +870,7 @@ func applySectionPayload(current RuntimeConfig, section Section, payload json.Ra
 		return RuntimeConfig{}, errors.New("configuration payload is empty")
 	}
 	candidate := cloneRuntimeConfig(current)
+	clearRelay := false
 	switch section {
 	case SectionRoot:
 		var value struct {
@@ -895,7 +896,15 @@ func applySectionPayload(current RuntimeConfig, section Section, payload json.Ra
 		if value.SMTPSectionConfig.Relay.Password.Configured() {
 			return RuntimeConfig{}, ErrInvalidSecretChange
 		}
-		value.SMTPSectionConfig.Relay.Password = current.SMTP.Relay.Password
+		clearRelay = value.SMTPSectionConfig.Relay.Clear
+		if !value.SMTPSectionConfig.Relay.relayEnabledSet {
+			value.SMTPSectionConfig.Relay.RelayEnabled = current.SMTP.Relay.RelayEnabled
+		}
+		if clearRelay {
+			clearSMTPRelay(&value.SMTPSectionConfig.Relay)
+		} else {
+			value.SMTPSectionConfig.Relay.Password = current.SMTP.Relay.Password
+		}
 		if smtpRelayConfigured(value.SMTPSectionConfig.Relay) && value.SMTPSectionConfig.Relay.Security == "" {
 			if ResolveMailSecurity(value.SMTPSectionConfig.Listener) == MailSecurityImplicitTLS {
 				value.SMTPSectionConfig.Relay.Security = MailSecurityImplicitTLS
@@ -923,7 +932,15 @@ func applySectionPayload(current RuntimeConfig, section Section, payload json.Ra
 		if value.MailSectionConfig.Relay.Password.Configured() {
 			return RuntimeConfig{}, ErrInvalidSecretChange
 		}
-		value.MailSectionConfig.Relay.Password = current.SMTP.Relay.Password
+		clearRelay = value.MailSectionConfig.Relay.Clear
+		if !value.MailSectionConfig.Relay.relayEnabledSet {
+			value.MailSectionConfig.Relay.RelayEnabled = current.SMTP.Relay.RelayEnabled
+		}
+		if clearRelay {
+			clearSMTPRelay(&value.MailSectionConfig.Relay)
+		} else {
+			value.MailSectionConfig.Relay.Password = current.SMTP.Relay.Password
+		}
 		if smtpRelayConfigured(value.Relay) && value.Relay.Security == "" {
 			if ResolveMailSecurity(value.Listener) == MailSecurityImplicitTLS {
 				value.Relay.Security = MailSecurityImplicitTLS
@@ -980,10 +997,29 @@ func applySectionPayload(current RuntimeConfig, section Section, payload json.Ra
 	if err := applySecretChanges(&candidate, section, changes, vault); err != nil {
 		return RuntimeConfig{}, err
 	}
+	if clearRelay {
+		clearSMTPRelay(&candidate.SMTP.Relay)
+	}
 	candidate.SetupState = candidate.Root.SetupState
 	return candidate, nil
 }
 
+func clearSMTPRelay(relay *SMTPConfig) {
+	if relay == nil {
+		return
+	}
+	relay.RelayEnabled = false
+	relay.RelayHost = ""
+	relay.RelayPort = 0
+	relay.Username = ""
+	relay.Password = StoredSecret{}
+	relay.Security = ""
+	relay.From = ""
+	relay.FromDomain = ""
+	relay.Clear = false
+	relay.relayEnabledSet = true
+}
+
 func setCandidateGeneration(candidate *RuntimeConfig, generation uint64) {
 	if candidate == nil {
 		return
diff --git a/backend/config/migrate.go b/backend/config/migrate.go
index 1a7cddc..78052a4 100644
--- a/backend/config/migrate.go
+++ b/backend/config/migrate.go
@@ -763,6 +763,7 @@ func validLegacyDatabasePassword(value string) bool {
 
 func legacySMTPConfig(root string, vault *credential.Vault, legacy legacyMigrationConfig) (SMTPConfig, []string, error) {
 	relay := SMTPConfig{
+		RelayEnabled:        legacy.SMTPHost != "" || legacy.SMTPPort != 0 || legacy.SMTPUsername != "" || legacy.SMTPFrom != "" || legacy.SMTPPassword != "",
 		RelayHost:           legacy.SMTPHost,
 		RelayPort:           legacy.SMTPPort,
 		Username:            legacy.SMTPUsername,
diff --git a/backend/config/model.go b/backend/config/model.go
index e647eb6..215221f 100644
--- a/backend/config/model.go
+++ b/backend/config/model.go
@@ -1,6 +1,9 @@
 package config
 
-import "time"
+import (
+	"encoding/json"
+	"time"
+)
 
 type SetupState string
 
@@ -82,6 +85,7 @@ type DatabaseConfig struct {
 }
 
 type SMTPConfig struct {
+	RelayEnabled        bool         `json:"enabled"`
 	RelayHost           string       `json:"relayHost"`
 	RelayPort           int          `json:"relayPort"`
 	Username            string       `json:"username"`
@@ -91,6 +95,42 @@ type SMTPConfig struct {
 	FromDomain          string       `json:"fromDomain"`
 	VerificationEnabled bool         `json:"verificationEnabled"`
 	LoginPolicy         string       `json:"loginPolicy"`
+	Clear               bool         `json:"clear,omitempty"`
+	relayEnabledSet     bool         `json:"-"`
+}
+
+func (s *SMTPConfig) UnmarshalJSON(data []byte) error {
+	type smtpConfigAlias SMTPConfig
+	var value smtpConfigAlias
+	if err := json.Unmarshal(data, &value); err != nil {
+		return err
+	}
+	var fields map[string]json.RawMessage
+	if err := json.Unmarshal(data, &fields); err != nil {
+		return err
+	}
+	*s = SMTPConfig(value)
+	_, enabledProvided := fields["enabled"]
+	configured := smtpRelayFieldsConfigured(*s)
+	s.relayEnabledSet = enabledProvided && (s.RelayEnabled || configured)
+	if !enabledProvided {
+		s.RelayEnabled = configured
+	}
+	return nil
+}
+
+func (s SMTPConfig) MarshalJSON() ([]byte, error) {
+	type smtpConfigAlias SMTPConfig
+	data, err := json.Marshal(smtpConfigAlias(s))
+	if err != nil || s.RelayEnabled || s.relayEnabledSet {
+		return data, err
+	}
+	var fields map[string]json.RawMessage
+	if err := json.Unmarshal(data, &fields); err != nil {
+		return nil, err
+	}
+	delete(fields, "enabled")
+	return json.Marshal(fields)
 }
 
 type EmailConfig struct {
diff --git a/backend/config/runtime_access.go b/backend/config/runtime_access.go
index 77c5219..c710284 100644
--- a/backend/config/runtime_access.go
+++ b/backend/config/runtime_access.go
@@ -288,6 +288,7 @@ func CurrentSMTPRuntimeSettings() (SMTPRuntimeSettings, error) {
 		return SMTPRuntimeSettings{}, fmt.Errorf("runtime configuration is unavailable")
 	}
 	settings.Relay = SMTPConfig{
+		RelayEnabled:        cfg.SMTPHost != "" || cfg.SMTPPort != 0 || cfg.SMTPUsername != "" || cfg.SMTPFrom != "" || cfg.SMTPPassword != "",
 		RelayHost:           cfg.SMTPHost,
 		RelayPort:           cfg.SMTPPort,
 		Username:            cfg.SMTPUsername,
diff --git a/backend/config/validator.go b/backend/config/validator.go
index 6e4471b..a42a8e0 100644
--- a/backend/config/validator.go
+++ b/backend/config/validator.go
@@ -152,8 +152,7 @@ func validateSMTP(smtp SMTPConfig) error {
 			return ErrInvalidSMTP
 		}
 	}
-	relayConfigured := smtpRelayConfigured(smtp)
-	if !relayConfigured {
+	if !smtpRelayEnabled(smtp) {
 		return nil
 	}
 	if smtp.RelayHost == "" || smtp.RelayPort == 0 || smtp.Security == "" || smtp.From == "" || smtp.FromDomain == "" {
@@ -169,12 +168,22 @@ func validateSMTP(smtp SMTPConfig) error {
 	return nil
 }
 
-// smtpRelayConfigured 只把实际连接或发件身份字段视为启用中继。
-// 推荐端口、统一加密方式和默认发件域名单独存在时，中继仍保持可选状态。
-func smtpRelayConfigured(smtp SMTPConfig) bool {
+func smtpRelayFieldsConfigured(smtp SMTPConfig) bool {
 	return smtp.RelayHost != "" || smtp.Username != "" || smtp.Password.Configured() || smtp.From != ""
 }
 
+func smtpRelayConfigured(smtp SMTPConfig) bool {
+	return smtpRelayFieldsConfigured(smtp) || smtp.RelayEnabled
+}
+
+func smtpRelayEnabled(smtp SMTPConfig) bool {
+	return smtp.RelayEnabled || (!smtp.relayEnabledSet && smtpRelayFieldsConfigured(smtp))
+}
+
+func (smtp SMTPConfig) RelayActive() bool {
+	return smtpRelayEnabled(smtp)
+}
+
 func validateSSL(ssl SSLConfig) error {
 	if err := validateDNSProvider(ssl); err != nil {
 		return err
diff --git a/backend/controllers/config.go b/backend/controllers/config.go
index a545fb6..43fb999 100644
--- a/backend/controllers/config.go
+++ b/backend/controllers/config.go
@@ -456,6 +456,7 @@ func publicConfigSection(runtime config.RuntimeConfig, section config.Section) (
 			"meta":     runtime.SMTP.Meta,
 			"listener": config.SMTPListenerConfig{Port: ports.SMTP, STARTTLSPort: ports.SMTPSTARTTLS, TLSPort: ports.SMTPTLS, Security: config.PublicMailSecurity(runtime.SMTP.Listener)},
 			"relay": map[string]any{
+				"enabled":             runtime.SMTP.Relay.RelayEnabled,
 				"relayHost":           runtime.SMTP.Relay.RelayHost,
 				"relayPort":           runtime.SMTP.Relay.RelayPort,
 				"username":            runtime.SMTP.Relay.Username,
@@ -474,6 +475,7 @@ func publicConfigSection(runtime config.RuntimeConfig, section config.Section) (
 			"meta":     runtime.SMTP.Meta,
 			"listener": config.SMTPListenerConfig{Port: ports.SMTP, STARTTLSPort: ports.SMTPSTARTTLS, TLSPort: ports.SMTPTLS, Security: config.PublicMailSecurity(runtime.SMTP.Listener)},
 			"relay": map[string]any{
+				"enabled":             runtime.SMTP.Relay.RelayEnabled,
 				"relayHost":           runtime.SMTP.Relay.RelayHost,
 				"relayPort":           runtime.SMTP.Relay.RelayPort,
 				"username":            runtime.SMTP.Relay.Username,
diff --git a/backend/res_init/verification_delivery.go b/backend/res_init/verification_delivery.go
index ece3de1..941aa5e 100644
--- a/backend/res_init/verification_delivery.go
+++ b/backend/res_init/verification_delivery.go
@@ -81,11 +81,7 @@ func smtpRelayComplete(settings config.SMTPRuntimeSettings) bool {
 }
 
 func smtpRelayRequested(settings config.SMTPRuntimeSettings) bool {
-	relay := settings.Relay
-	return strings.TrimSpace(relay.RelayHost) != "" ||
-		strings.TrimSpace(relay.Username) != "" ||
-		strings.TrimSpace(settings.Password) != "" ||
-		strings.TrimSpace(relay.From) != ""
+	return settings.Relay.RelayActive()
 }
 
 func verificationSMTPSettings(settings config.SMTPRuntimeSettings) (verification.SMTPSettings, error) {
diff --git a/frontend/src/views/components/ConfigSettings/ConfigForm/ConfigForm.js b/frontend/src/views/components/ConfigSettings/ConfigForm/ConfigForm.js
index 57aa639..243f0f6 100644
--- a/frontend/src/views/components/ConfigSettings/ConfigForm/ConfigForm.js
+++ b/frontend/src/views/components/ConfigSettings/ConfigForm/ConfigForm.js
@@ -15,8 +15,9 @@ export const relaySecurityForMail = config => mailSecurity(config) === 'implicit
 const startTLSMail = config => mailSecurity(config) === 'starttls'
 const implicitTLSMail = config => mailSecurity(config) === 'implicit_tls'
 export const relayConfigured = config => !!(
-  config.relay?.relayHost || config.relay?.username || config.relay?.password ||
-  config.relay?.from
+  config.relay?.enabled || config.relay?.relayHost || config.relay?.relayPort ||
+  config.relay?.username || config.relay?.password || config.relay?.security ||
+  config.relay?.from || config.relay?.fromDomain
 )
 
 export function readFormConfig(text) {
@@ -141,6 +142,7 @@ const mailGroups = [
     port('pop3.tlsPort', 'POP3 端口（隐式 TLS）', { min: 1, required: true, show: config => !startTLSMail(config), hint: '默认 995，客户端建立连接时直接使用 TLS。' })
   ]),
   group('relay', 'SMTP 中继连接（可选）', '', [
+    field('relay.enabled', '启用 SMTP 中继', 'switch', { hint: '关闭后保留配置，但系统不会使用该中继发信。' }),
     field('relay.relayHost', 'SMTP 服务器', 'text', { placeholder: 'smtp.example.com' }),
     port('relay.relayPort', 'SMTP 发信中继端口', { hint: '外部 SMTP 服务器端口，与本机监听无关；选择加密方式后自动填写。' }),
     field('relay.username', '认证用户名', 'text', { placeholder: '需要认证时填写' }),
@@ -281,14 +283,16 @@ export function updateFormConfig(text, section, path, value) {
   if (!Array.isArray(path) || path.some(key => ['__proto__', 'prototype', 'constructor'].includes(key))) return text
   const key = path.join('.')
   const input = getFieldGroups(section, config).flatMap(item => item.fields).find(item => fieldKey(item) === key)
-  if (!input || input.locked) return text
+  const isRelayClear = section === 'mail' && key === 'relay.clear'
+  if ((!input && !isRelayClear) || input?.locked) return text
   const previousValue = getValue(config, path)
   let parent = config
   for (const part of path.slice(0, -1)) {
     if (!parent[part] || typeof parent[part] !== 'object') parent[part] = {}
     parent = parent[part]
   }
-  parent[path.at(-1)] = value ?? (input.type === 'number' ? null : '')
+  parent[path.at(-1)] = value ?? (input?.type === 'number' ? null : '')
+  if (key.startsWith('relay.') && key !== 'relay.clear' && config.relay) config.relay.clear = false
   if (previousValue !== value) {
     if (key === 'listener.security' && ['both', 'starttls', 'implicit_tls'].includes(value)) {
       const startTLS = value === 'starttls'
@@ -305,7 +309,7 @@ export function updateFormConfig(text, section, path, value) {
       config.relay.security = relaySecurityForMail(config)
       config.relay.relayPort = smtpPorts.get(config.relay.security)
     }
-    if (key.startsWith('relay.') && key !== 'relay.security' && relayConfigured(config) && ['both', 'starttls', 'implicit_tls'].includes(mailSecurity(config))) {
+    if (key.startsWith('relay.') && key !== 'relay.security' && key !== 'relay.enabled' && relayConfigured(config) && ['both', 'starttls', 'implicit_tls'].includes(mailSecurity(config))) {
       config.relay.security = relaySecurityForMail(config)
       if (!validPort(config.relay.relayPort)) config.relay.relayPort = smtpPorts.get(config.relay.security)
     }
@@ -365,10 +369,11 @@ export function validateFormConfig(section, config) {
   if (section === 'mail') {
     const relay = config.relay || {}
     const configured = relayConfigured(config)
+    const enabled = relay.enabled === true || (relay.enabled === undefined && configured)
     if (!['both', 'starttls', 'implicit_tls'].includes(mailSecurity(config))) {
       errors['listener.security'] = '请选择全部启用、STARTTLS / STLS 或隐式 TLS'
     }
-    if (configured) {
+    if (enabled && !relay.clear) {
       if (!relay.relayHost) errors['relay.relayHost'] = '请填写 SMTP 服务器'
       const relaySecurity = normalizedMailSecurity(relay.security)
       if (!['starttls', 'implicit_tls'].includes(relaySecurity)) errors['listener.security'] = '请先选择统一加密方式'
diff --git a/frontend/src/views/components/ConfigSettings/ConfigForm/ConfigForm.vue b/frontend/src/views/components/ConfigSettings/ConfigForm/ConfigForm.vue
index 8c98e7c..ee0107d 100644
--- a/frontend/src/views/components/ConfigSettings/ConfigForm/ConfigForm.vue
+++ b/frontend/src/views/components/ConfigSettings/ConfigForm/ConfigForm.vue
@@ -8,11 +8,19 @@
       :data-group="group.id"
       :aria-label="group.title"
     >
-      <div class="form-group-heading">
+      <div v-if="!(section === 'mail' && group.id === 'relay')" class="form-group-heading">
         <h4>{{ group.title }}</h4>
         <span v-if="group.fields.some(field => errors[fieldKey(field)])" class="section-error">待修正</span>
       </div>
-      <div class="form-grid" :class="{ 'site-grid': section === 'base' && group.id === 'site' }">
+      <RelayConfig
+        v-if="section === 'mail' && group.id === 'relay'"
+        :config="config"
+        :fields="group.fields"
+        :errors="errors"
+        :disabled="disabled"
+        @change="(path, value) => emit('change', path, value)"
+      />
+      <div v-else class="form-grid" :class="{ 'site-grid': section === 'base' && group.id === 'site' }">
         <ConfigField
           v-for="field in group.fields"
           :key="fieldKey(field)"
@@ -31,6 +39,7 @@
 import { computed } from 'vue'
 import { fieldKey, getFieldGroups, getValue } from './ConfigForm.js'
 import ConfigField from '../ConfigField/ConfigField.vue'
+import RelayConfig from '../RelayConfig/RelayConfig.vue'
 
 const props = defineProps({
   section: { type: String, required: true },
diff --git a/frontend/src/views/components/ConfigSettings/ConfigSettings.js b/frontend/src/views/components/ConfigSettings/ConfigSettings.js
index 7f40878..77cd0d0 100644
--- a/frontend/src/views/components/ConfigSettings/ConfigSettings.js
+++ b/frontend/src/views/components/ConfigSettings/ConfigSettings.js
@@ -555,7 +555,7 @@ export function usePage(pageKey = 'base') {
       secretChanges['database.password'] = { operation: 'replace', value: { plaintext: value } }
     }
     const relayPassword = formConfig.value?.relay?.password
-    if (relayPassword && selectedSection.value === 'mail') {
+    if (relayPassword && selectedSection.value === 'mail' && !formConfig.value?.relay?.clear) {
       secretChanges['relay.password'] = { operation: 'replace', value: { plaintext: relayPassword } }
     }
     if (selectedSection.value === 'ssl' && formConfig.value?.tls?.dnsProvider === 'alidns') {
diff --git a/frontend/src/views/components/ConfigSettings/RelayConfig/RelayConfig.css b/frontend/src/views/components/ConfigSettings/RelayConfig/RelayConfig.css
new file mode 100644
index 0000000..c1dcc42
--- /dev/null
+++ b/frontend/src/views/components/ConfigSettings/RelayConfig/RelayConfig.css
@@ -0,0 +1,103 @@
+.relay-config {
+  display: flex;
+  flex-direction: column;
+  gap: 16px;
+  grid-column: 1 / -1;
+}
+
+.relay-list-heading,
+.relay-item-heading,
+.relay-editor-heading,
+.relay-item-actions,
+.relay-editor-actions {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 16px;
+}
+
+.relay-list-heading h5,
+.relay-editor-heading h5 {
+  margin: 0;
+  color: var(--el-text-color-primary);
+  font-size: 15px;
+}
+
+.relay-list-heading p,
+.relay-editor-heading span,
+.relay-subtitle {
+  margin: 5px 0 0;
+  color: var(--el-text-color-secondary);
+  font-size: 13px;
+}
+
+.relay-list {
+  display: grid;
+  gap: 12px;
+}
+
+.relay-item {
+  padding: 16px;
+  border: 1px solid var(--el-border-color-light);
+  border-radius: 8px;
+  background: var(--el-fill-color-blank);
+}
+
+.relay-summary {
+  display: grid;
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+  gap: 12px 20px;
+  margin: 18px 0;
+}
+
+.relay-summary div {
+  min-width: 0;
+}
+
+.relay-summary dt {
+  color: var(--el-text-color-secondary);
+  font-size: 12px;
+}
+
+.relay-summary dd {
+  margin: 4px 0 0;
+  overflow: hidden;
+  color: var(--el-text-color-primary);
+  font-size: 14px;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.relay-editor {
+  padding: 16px;
+  border: 1px solid var(--el-border-color-light);
+  border-radius: 8px;
+  background: var(--el-fill-color-lighter);
+}
+
+.relay-fields {
+  margin-top: 16px;
+}
+
+.relay-alert {
+  margin: 0;
+}
+
+@media (max-width: 900px) {
+  .relay-summary {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+  }
+}
+
+@media (max-width: 600px) {
+  .relay-list-heading,
+  .relay-item-heading,
+  .relay-editor-heading {
+    align-items: flex-start;
+    flex-direction: column;
+  }
+
+  .relay-summary {
+    grid-template-columns: 1fr;
+  }
+}
\ No newline at end of file
diff --git a/frontend/src/views/components/ConfigSettings/RelayConfig/RelayConfig.vue b/frontend/src/views/components/ConfigSettings/RelayConfig/RelayConfig.vue
new file mode 100644
index 0000000..c67a14f
--- /dev/null
+++ b/frontend/src/views/components/ConfigSettings/RelayConfig/RelayConfig.vue
@@ -0,0 +1,107 @@
+<template>
+  <div class="relay-config">
+    <div class="relay-list-heading">
+      <div>
+        <h5>已配置的 SMTP 中继</h5>
+        <p>中继配置独立于本机邮件服务；关闭开关只停止使用，不会删除已填写的信息。</p>
+      </div>
+      <el-button v-if="hasConfigured && !editing" type="primary" plain :disabled="disabled" @click="editing = true">
+        编辑中继
+      </el-button>
+    </div>
+
+    <el-alert
+      v-if="relay.clear"
+      title="已标记清除，保存后将删除服务器、端口、账号、密码、发件邮箱和发件域名。"
+      type="warning"
+      :closable="false"
+      show-icon
+      class="relay-alert"
+    />
+
+    <div v-if="hasConfigured && !editing" class="relay-list" role="list" aria-label="SMTP 中继列表">
+      <article class="relay-item" role="listitem">
+        <div class="relay-item-heading">
+          <div>
+            <strong>默认 SMTP 中继</strong>
+            <span class="relay-subtitle">单个默认发信中继配置</span>
+          </div>
+          <el-tag :type="relay.enabled ? 'success' : 'info'" effect="plain">
+            {{ relay.enabled ? '已启用' : '已关闭' }}
+          </el-tag>
+        </div>
+        <dl class="relay-summary">
+          <div><dt>SMTP 服务器</dt><dd>{{ relay.relayHost || '未填写' }}</dd></div>
+          <div><dt>端口</dt><dd>{{ relay.relayPort || '未填写' }}</dd></div>
+          <div><dt>认证账号</dt><dd>{{ relay.username || '未填写' }}</dd></div>
+          <div><dt>发件邮箱</dt><dd>{{ relay.from || '未填写' }}</dd></div>
+          <div><dt>密码</dt><dd>{{ passwordConfigured ? '已配置（不显示明文）' : '未配置' }}</dd></div>
+          <div><dt>发件域名</dt><dd>{{ relay.fromDomain || '未填写' }}</dd></div>
+        </dl>
+        <div class="relay-item-actions">
+          <el-button type="primary" plain :disabled="disabled" @click="editing = true">编辑</el-button>
+          <el-button type="danger" plain :disabled="disabled" @click="clearRelay">清除中继</el-button>
+        </div>
+      </article>
+    </div>
+
+    <el-empty v-else-if="!editing" description="暂无已配置的 SMTP 中继" />
+
+    <div v-if="editing" class="relay-editor">
+      <div class="relay-editor-heading">
+        <h5>{{ hasConfigured ? '编辑 SMTP 中继' : '添加 SMTP 中继' }}</h5>
+        <span>密码留空表示保持原值，清除操作需要单独点击“清除中继”。</span>
+      </div>
+      <div class="form-grid relay-fields">
+        <ConfigField
+          v-for="field in fields"
+          :key="fieldKey(field)"
+          :field="field"
+          :value="getValue(config, field.path)"
+          :error="errors[fieldKey(field)]"
+          :disabled="disabled"
+          @change="(path, value) => emit('change', path, value)"
+        />
+      </div>
+      <div class="relay-editor-actions">
+        <el-button v-if="hasConfigured" :disabled="disabled" @click="editing = false">取消编辑</el-button>
+        <el-button v-if="hasConfigured" type="danger" plain :disabled="disabled" @click="clearRelay">清除中继</el-button>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { computed, ref } from 'vue'
+import { ElMessageBox } from 'element-plus'
+import ConfigField from '../ConfigField/ConfigField.vue'
+import { fieldKey, getValue, relayConfigured } from '../ConfigForm/ConfigForm.js'
+
+const props = defineProps({
+  config: { type: Object, required: true },
+  fields: { type: Array, required: true },
+  errors: { type: Object, default: () => ({}) },
+  disabled: Boolean
+})
+const emit = defineEmits(['change'])
+const relay = computed(() => props.config.relay || {})
+const hasConfigured = computed(() => relayConfigured(props.config))
+const passwordConfigured = computed(() => !!props.config.relayPasswordStatus?.configured)
+const editing = ref(!hasConfigured.value)
+
+const clearRelay = async () => {
+  try {
+    await ElMessageBox.confirm(
+      '清除后将删除已保存的 SMTP 中继信息和密码，关闭中继开关不会产生此影响。确认清除吗？',
+      '确认清除 SMTP 中继',
+      { type: 'warning', confirmButtonText: '确认清除', cancelButtonText: '取消' }
+    )
+    emit('change', ['relay', 'clear'], true)
+    editing.value = false
+  } catch (error) {
+    if (error !== 'cancel' && error !== 'close') throw error
+  }
+}
+</script>
+
+<style scoped src="./RelayConfig.css"></style>
\ No newline at end of file